Some fishes grow too large for tanks, needing vast spaces to thrive. Keeping them in small tanks can stress them and stunt their growth. Size matters in their habitat.
Certain fish need highly specific water conditions like temperature, pH, or salinity. Even slight changes in their water can lead to health issues or even death.
Aggressive fish can harm tank mates due to territorial behavior. They require isolated environments or special setups to prevent constant fights and injuries.
Some species produce too much waste, which leads to poor water quality. Maintaining clean water for these fishes can be costly and time-consuming in small tanks.
Rare fishes often come from wild habitats, making them hard to care for. Removing them disrupts ecosystems, and their survival rates in tanks are usually low.
Delicate fishes can be sensitive to lighting or water flow. Even slight disruptions in their tank can cause stress, making them unsuitable for home setups.
Certain exotic species have specialized diets that are hard to replicate in home tanks. Missing nutrients in their diet can lead to malnutrition or health problems.